122197818561 has 16 divisors (see below), whose sum is σ = 200529753984. Its totient is φ = 64455992064.

The previous prime is 122197818557. The next prime is 122197818563. The reversal of 122197818561 is 165818791221.

It is a happy number.

It is not a de Polignac number, because 122197818561 - 2² = 122197818557 is a prime.

It is a super-2 number, since 2×122197818561² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (122197818563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223805256 + ... + 223805801.

It is an arithmetic number, because the mean of its divisors is an integer number (12533109624).

Almost surely, 2^122197818561 is an apocalyptic number.

It is an amenable number.

122197818561 is a deficient number, since it is larger than the sum of its proper divisors (78331935423).

122197818561 is a wasteful number, since it uses less digits than its factorization.

122197818561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447611080.

The product of its digits is 483840, while the sum is 51.

The spelling of 122197818561 in words is "one hundred twenty-two billion, one hundred ninety-seven million, eight hundred eighteen thousand, five hundred sixty-one".